How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Eric Your Own Question

Eric
Eric, Home Appliance Technician
Category: Appliance
Satisfied Customers: 244
Experience:  Factory/company training at MAJOR retailer, now owns and operates an appliance repair business.
Type Your Appliance Question Here...
Eric is online now
A new question is answered every 9 seconds

I have a 15 year old Bosch SMU 2000 dishwasher that is not

Resolved Question:

I have a 15 year old Bosch SMU 2000 dishwasher that is not heating. It runs the entire cycle, but the water does not get any hotter than the water supply (120 degrees), and the element does not come on for drying at the end of the cycle.
Submitted: 2 years ago.
Category: Appliance
Expert:  Eric replied 2 years ago.

Eric :

Hello and thanks for using JustAnswer!! My name is XXXXX XXXXX X am happy to help you with this dishwasher problem today!

Eric :

Hello and thanks for using JustAnswer! My name is XXXXX XXXXX X am happy to help you with you dishwasher problem today!!

Customer:

Does the description make sense?

Customer:

Runs through all cycles, but no heat added by the machine

Eric :

If you checked the 161 deg stat and it is closed, as well as the f6 hi-limit and the f5 hi-limit, but as you say the f5 hi-limit is open and assuming as you said, the element has continuity, the problem HAS to be a faulty f5 hi limit switch/thermostat. The only other possibility is a failure of the terminals at u6 in the timer control. You can verify that the the f5 hi-limit is in fact bad by temporarily jumping between the terminals on hi-limit stat f5 and trying again. The Hi limits will always be closed circuit until the temperature has reached 185 degrees. There is no other possible cause for you problem accordinf to the schemeatic.

Eric :

^ schematic.

Eric :

Please feel free to ask any further questions you may have and if I have helped you, PLEASE hit the ACCEPT button . Thanks!!

Customer:

So jump the WH/VT and the Red wires and let it run?

Eric :

The diagram does not specify the wire colors for this machine, but if those are the wires connecting to hi stat f5, then yes

Customer:

I'll give that a shot

Eric :

Great. let me know how it goes

Eric :

You can also verify current flow through the circuit by connecting a voltmeter in parallel with the heater element, but this is NOT alltogether necessary

Eric :

At least verify a circuit (voltage) across the load (element) not current flow, sorry :)

Customer:

Jumping accross blows the circuit

Customer:

across

Eric :

you mean the breaker?

Customer:

yep

Eric :

are you sure you jumped across the f5 hi limit and not the element?

Customer:

yes. the high limit has one connection on one side and two on the opposite

Customer:

the two together have continuity so I figured it didn't matter which of those I connected to

Eric :

It does, because one of those connections is where the feed from the 161 degree comes in. hang on...

Eric :

did you just jump across the two terminals that showed open circuit?

Eric :

on f5?

Customer:

yep

Customer:

there is a wire that goes from f5 to the thermostat

Customer:

there is continuity across the thermostat

Customer:

there is continuity on f6.

Customer:

just none on f5

Customer:

makes little sense to me unless somehow f5 is grounded..??

Eric :

f5 goes straight to neutral and if there were a ground fault, you would be having problems with other parts of the dishwasher, which you are not. correct?

Customer:

correct

Customer:

maybe we should just replace f5 and see if that works. What I am not quite understanding is how I can go full cycle, tripping the appropriate sensors while not having water hot enough to clean the dishes. Does that key any other possible issue for you?

Eric :

This is most likely a problem with the contacts in the timer. This area of ANY timer on a timer controlled appliance is the most current drawing contact on a timer. This happen with dryers as well. I am willing to bet that the timer contacts at u6 inside the timer have worn/burned away. This problem would require replacement of the timer. There is really nothing else in the circuit that would cause this based on your testing and the operating condition of the machine.

Customer:

I've got a spare timer....maybe I'll try that

Eric :

Yeas. Put that in and see what happens. I have been known to open timers just to see for myself, even though there is no repair possible. Thats just the kind of tech I am. LOL

Customer:

I've got to run out to a meeting, but I'll check u6 and/or replace the timer to see if that will do it. But, I should have continuity across f5 though, right?

Eric :

Yes. As long as the temp is below 185, f5 will always be open.

Eric :

sorry, closed

Customer:

scared me for a sec

Eric :

LOL

Eric :

Sometimes I scare myself

Customer:

thanks, XXXXX XXXXX get back to you as soon as I try these couple of things

Eric :

ok. Ill be around. Take care friend

Customer:

Thanks

Customer:

you too

Eric :

I know you are away, but I just found some old diagrams that show the color codes for the wires on this machine and in case you have not already figured this out, on stat f5, the red and wht/vt terminals should be closed circuit at all times until 185 degrees is sensed. Also, contacts u6 inside the timer correspond to the gray/blk wires coming from the timer.The terminals SHOULD be labeled 6a and 6b (both gray/blk) . To check the entire heater circuit, connect an ohmeter to that wire when disconnected to neutral and you should get a reading in the low ohms. This means the entire heater circuit is ok and the problem MUST be in the timer, likely at contacts u6. One other way to check u6 in the timer is to connect ohmeter to terminal 6a or b (where grey/blk wire was) when the timer is in a DRY cycle and L1 (power HOT) into the timer. Obviously, this is ALL done with power disconnected LOL. One more problem with these if I remember correctly was that sometimes the wiring located in the protective sheath behind the door panel near the bottom of the machine would become exposed and short to ground, but that was usually a whole machine problem, not specific functions but anything is possible.

Customer:

Bless you, Eric! I've got heat!

Eric, Home Appliance Technician
Category: Appliance
Satisfied Customers: 244
Experience: Factory/company training at MAJOR retailer, now owns and operates an appliance repair business.
Eric and 4 other Appliance Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Thank you for the expeditious answer. It's good to know you're out there and awake in the wee hours when I finally have time to ask questions about my Jenn Air. Jean Riverhead, NY
< Last | Next >
  • Thank you for the expeditious answer. It's good to know you're out there and awake in the wee hours when I finally have time to ask questions about my Jenn Air. Jean Riverhead, NY
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
 
 
 

Meet The Experts:

 
 
 
  • John

    Home Appliance Technician

    Satisfied Customers:

    13442
    Appliance repair business owner for over 43 years.
< Last | Next >
  • http://ww2.justanswer.com/uploads/docjohn174/2008-12-13_170143_johnask.jpg John's Avatar

    John

    Home Appliance Technician

    Satisfied Customers:

    13442
    Appliance repair business owner for over 43 years.
  • http://ww2.justanswer.com/uploads/tomgoe/2011-01-04_021913_2008-03-03_183612_phpexrmok_c2pm.jpg Tom Goellner's Avatar

    Tom Goellner

    Home Appliance Technician

    Satisfied Customers:

    1191
    32 yrs. experience servicing major appliances and HVAC equipment.
  • http://ww2.justanswer.com/uploads/MD/md2020/2012-6-6_20648_Selfpic.64x64.jpg Tyler Z.'s Avatar

    Tyler Z.

    Appliance Doc

    Satisfied Customers:

    51307
    7+ years being an appliance technician with factory training.
  • http://ww2.justanswer.com/uploads/bryanpaul52/2009-2-18_12031_0918081611.jpg Bryan's Avatar

    Bryan

    Home Appliance Technician

    Satisfied Customers:

    11158
    15 yrs. experience as a certified appliance technician.
  • http://ww2.justanswer.com/uploads/SM/smitty1486/2011-3-1_0145_Snapshotofme1.64x64.png Kelly's Avatar

    Kelly

    Appliance Technician

    Satisfied Customers:

    6493
    Highly accurate diagnostician with over 30 years experience!
  • http://ww2.justanswer.com/uploads/TH/TheHomeSmithy/2011-8-13_11146_homesmithy.500x500.64x64.jpg The Home Smithy's Avatar

    The Home Smithy

    Home Appliance Technician

    Satisfied Customers:

    5935
    30 years repairing appliances
  • http://ww2.justanswer.com/uploads/TE/Teamcold/2012-6-15_15028_HomeRepairsquarecopy.64x64.jpg Barry G.'s Avatar

    Barry G.

    Home Appliance Technician

    Satisfied Customers:

    5039
    27 years in home appliance repair. EPA refrigerant transition and recovery certification type I & II.